function print_pdf_wkhtmltopdf_print_pdf_generate in Printer, email and PDF versions 7.2

Implements hook_print_pdf_generate().

File

print_pdf/lib_handlers/print_pdf_wkhtmltopdf/print_pdf_wkhtmltopdf.pages.inc, line 16

Generates the PDF version using wkhtmltopdf.

Code

function print_pdf_wkhtmltopdf_print_pdf_generate($html, $meta, $paper_size = NULL, $page_orientation = NULL) {
  $pdf_tool = explode('|', variable_get('print_pdf_pdf_tool', PRINT_PDF_PDF_TOOL_DEFAULT));
  if (empty($paper_size)) {
    $paper_size = variable_get('print_pdf_paper_size', PRINT_PDF_PAPER_SIZE_DEFAULT);
  }
  if (empty($page_orientation)) {
    $page_orientation = variable_get('print_pdf_page_orientation', PRINT_PDF_PAGE_ORIENTATION_DEFAULT);
  }
  $wkhtmltopdf_options = variable_get('print_pdf_wkhtmltopdf_options', PRINT_PDF_WKHTMLTOPDF_OPTIONS);
  $dpi = 96;
  if (!empty($wkhtmltopdf_options) && isset($meta['node'])) {
    $wkhtmltopdf_options = token_replace($wkhtmltopdf_options, array(
      'node' => $meta['node'],
    ), array(
      'clear' => TRUE,
    ));
  }

  // Build array of single quoted parts, and the same escaped.
  preg_match_all("!'.+?'!", $wkhtmltopdf_options, $matches);
  $quoted = array();
  foreach ($matches[0] as $match) {
    $quoted[escapeshellcmd($match)] = $match;
  }

  // Prevent options that could result in execution of arbitrary commands.
  $wkhtmltopdf_options = escapeshellcmd($wkhtmltopdf_options);

  // Replace sections that were single quoted with original content.
  foreach ($quoted as $search => $replace) {
    $wkhtmltopdf_options = str_replace($search, $replace, $wkhtmltopdf_options);
  }
  $version = print_pdf_wkhtmltopdf_pdf_tool_version($pdf_tool[1], FALSE);

  // 0.10.0 beta2 identifies itself as 0.9.9.
  if (version_compare($version, '0.9.9', '>=')) {
    $wkhtmltopdf_options = '--disable-local-file-access ' . $wkhtmltopdf_options;
  }
  elseif (version_compare($version, '0.9.6', '>=')) {
    $wkhtmltopdf_options = '--disallow-local-file-access ' . $wkhtmltopdf_options;
  }
  else {
    drupal_goto($meta['url']);
    exit;
  }

  // Use basic http authentication to fetch included CSS, etc.
  if (isset($_SERVER['PHP_AUTH_USER']) && isset($_SERVER['PHP_AUTH_PW'])) {
    $wkhtmltopdf_options .= ' --username ' . escapeshellarg($_SERVER['PHP_AUTH_USER']) . ' --password ' . escapeshellarg($_SERVER['PHP_AUTH_PW']);
  }

  // hook_print_pdf_wkhtmltopdf_alter().
  drupal_alter('print_pdf_wkhtmltopdf', $wkhtmltopdf_options, $html, $meta);
  $use_input_file = variable_get('print_pdf_wkhtmltopdf_use_input_file', PRINT_PDF_WKHTMLTOPDF_USE_INPUT_FILE_DEFAULT);
  if ($use_input_file) {
    $temp_html = file_unmanaged_save_data($html, drupal_tempnam('temporary://', 'c_html_') . '.html', FILE_EXISTS_RENAME);
    if ($temp_html === FALSE) {
      watchdog('print_pdf', 'wkhtmltopdf: could not create temporary html file: %file', array(
        '%file' => $temp_html,
      ));
      drupal_goto($meta['url']);
      return NULL;
    }
    $html_input_parameter = drupal_realpath($temp_html);
  }
  else {
    $temp_html = '';
    $html_input_parameter = '-';
  }
  $descriptor = array(
    0 => array(
      'pipe',
      'r',
    ),
    1 => array(
      'pipe',
      'w',
    ),
    2 => array(
      'pipe',
      'a',
    ),
  );
  $cmd = '"' . realpath($pdf_tool[1]) . "\" -q --page-size {$paper_size} --orientation {$page_orientation} --dpi {$dpi} {$wkhtmltopdf_options} {$html_input_parameter} -";
  $process = proc_open($cmd, $descriptor, $pipes, NULL, NULL);
  if (is_resource($process)) {
    if (!$use_input_file) {
      fwrite($pipes[0], $html);
      fclose($pipes[0]);
    }
    $pdf = stream_get_contents($pipes[1]);
    fclose($pipes[1]);
    stream_set_blocking($pipes[2], 0);
    $error = stream_get_contents($pipes[2]);
    fclose($pipes[2]);
    $retval = proc_close($process);
    if (!empty($error) || $retval != 0) {
      if (empty($error)) {
        $error = 'No stderr output available.';
      }
      watchdog('print_pdf', 'wkhtmltopdf [%cmd] (returned %ret): %error', array(
        '%cmd' => $cmd,
        '%ret' => $retval,
        '%error' => $error,
      ));
    }
  }
  if ($use_input_file) {
    file_unmanaged_delete($temp_html);
  }
  if (!empty($pdf)) {

    // Remove anything before actual PDF content.
    $pdf = substr($pdf, strpos($pdf, '%PDF-'));
    return $pdf;
  }
  else {
    drupal_set_message(t('Unable to generate PDF file.'), 'error');
    drupal_goto($meta['url']);
    return NULL;
  }
}